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2003 Nissan Altima S - Camshaft & Crankshaft Position Sensors

2003 Nissan Altima S 2.5L W/Automatic Transmission PROBLEM: INTERMITTENT NO-STARTS & ROUGH-STARTS WITH NO DTCs SET. A LOCAL AUTOSHOP HAD REPLACED ONLY THE CAMSHAFT POSITION SENSOR, MADE SURE NO DTCs PRESENT AND OPS CHECK GOOD. HOWEVER, THE PROBLEM RETURNED. NOW, THE SAME AUTOSHOP BELIEVES THAT THE FAULT IS WITH THE TRANSMISSION FLEX PLATE, WHICH MAY HAVE DAMAGED THE CRANKSHAFT POSITION SENSOR AS WELL, ACCORDING TO HIM. ESTIMATE IS AT ~$750. The mechanic didn't try to replace the Crankshaft sensor alone, he went straight for the Tranny drop. I figured go with the cheap fix first. If it comes back, then we will look into the Flex Plate. I replaced the recently replaced Camshaft sensor & the never been replaced Crankshaft sensor. So far, so good. Replacing the Camshaft sensor is a 2-minute job. The Crankshaft sensor will likely take 30 times as long. It seems like the Old Crankshaft Position sensor I removed was a bit high on a resistance check, when compared to brand new sensors. With too high a resistance value, the sensor may not make use of the full voltage it is receiving and/or it may not return the required amount of voltage to the Powertrain Control Module (PCM), which will lead to irregular engine operation or a no-start condition. Both Camshaft & Crankshaft sensors are the same part number. The 3rd version of the sensor is encased in metal, not plastic. The OEM part number is 23731-6N21A ($44 us) The old part numbers were encased in plastic. These part numbers should not be used: 23731-8J005 & 23731-8J006 FOR ONLINE PART PURCHASE: http://www.nissanpartszone.com/components/2003-nissan-altima_engine-control-module-226-12.html "DIGITALDXING" PROVIDED THE LINKS LISTED BELOW AND POSTED SOME PICTURES (2003 NISSAN ALTIMA 2.5L) http://x.nissanhelp.com/forums/members/digitaldxing-albums-2003-nissan-altima-crankshaft-position-sensor-picture331-2003-nissan-altima-crankshaft-position-sensor.html#picturecomment_19 "PAUL" POSTED HIS PICUTRES HERE (2002 NISSAN ALTIMA 2.5L) http://www.paulstravelpictures.com/Nissan-Altima-Camshaft-Crankshaft-Sensors/ "DENTNSHELL" POSTED HIS FIX HERE (2005 NISSAN ALTIMA 2.5L) http://dentnshell.com/Projects/2005Altima/CamkPosition.html "MULEMAN" POSTED A GREAT STEP-BY-STEP WRITE UP WITH PICTURES HERE (2006 NISSAN ALTIMA 2.5L) http://www.nissanclub.com/forums/f-q-2002-2006/286857-diy-crankshaft-position-sensor-cps-2006-2-5-altima.html Thanks a bunch, muleman. ...ACTUALLY, THAT WHOLE THREAD AT NISSANCLUB.COM IS A GOOD READ. Yahoo! Answers Best Answer - Chosen by Voters Nissan recalls that problem to reprogram the ECU. What happens the crank sensor electrical terminals seep oil into the crank sensors plug. The new metal crank sensors correct this problem. Location of this sensor on the back of the motor is difficult to change and you need gorrilia finger grip to depress the connector green lock and remove the sensor. Depending on your cars Vin# Recall Campaign # R0712 NHTSA# 07V-527. Hopefully your factory warranty replaces the sensor no charge 5yr/60,000 mile. The campaign only covers the ECM reprogram. The ECM reprogram makes both sensors act as one so either will allow the car to start. Stalling and not starting is a safety risk. Source(s): Nissan Master Technician (John Paul) http://answers.yahoo.com/question/index?qid=20080402214141AA7yQjR For some information on related DTC faults: http://www.obd-codes.com/p0340 http://www.obd-codes.com/p0335 http://www.obd-codes.com/p0385


 


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2002 Nissan Altima 2.5S Misfire start
This Nissan Altima was sold (used) to me with this problem hidden, and a few weeks later, it began to get noticeable, and it continued to get worse. I ended up losing around $7,000 total. I had this car checked by a master mechanic who works at a local dealership and does excellent work, and noone had thought this car would give any trouble. After several weeks, we noticed it eating approximately 1qt / wk of oil, and as well having issues starting and misfiring (all caused by the same thing). To those of you thinking of purchasing a Nissan, my advice is don't, and especially not from Armo Motors. They sold this engine (First gen QR25DE) for 4 years, in the 2002 - 2006 Nissan Altima 2.5S, the 2002 - 2006 Sentra SE-R, and the 2005 Frontier, and ALL THREE have issues. Nissan has had a few recalls on them, but still refuses to admit that all those cars had issues. They claim that although the engine is the same, and shows the same issues, that it is only truly their fault in a few cases. My particular car had two major issues that Nissan shoved under the carpet. The first is that the mesh that holds the catalytic converter material in place can come off, and cat material can clog the Exhaust, or worse, get pushed into the engine. The second is that the screws that hold the butterfly valves in place can come loose and literally get sucked into the engine. Both of these will cause increased oil consumption, and (evenually) can lead to a dead engine. After contacting the dealer at Armo Motors: http://www.yellowpages.com/fort-walton-beach-fl/mip/armo-motors-455256640, I asked if he could possible help with part of rebuilding the engine, and he said he had a shop that could do it, and he would pay half. We were about to get it rebuilt, and when we went to ask for his half, he said 'I've talked to my lawyer, and he says it's best that I don't help you because it would imply that there was a warranty on the car, which would give you further grounds to sue' and hung up. I bought a Honda Civic since then and took the hit; Still waiting from that settlement from Nissan though. http://www.youtube.com/watch?v=5r_9qcSQBfc is a continuation of problems I had




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